# Billy MCP by usefulapi (remote · billy.usefulapi.io)

Read Billy invoices, bills, contacts, products and postings; create contacts and draft invoices.

- Trust score: 64/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-17

## Components

- remote · `billy.usefulapi.io`: 64/100 (this document), [markdown](https://verifymcp.io/servers/io-usefulapi-billy/billy.md), [page](https://verifymcp.io/servers/io-usefulapi-billy/billy)

## Channel facts

- Endpoint: `https://billy.usefulapi.io/mcp`
- Transports: `streamable-http`
- Auth: `required`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-17.

- **Endpoint Security**: 78/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation is enforced on tool calls, advertised via RFC 9728 protected-resource metadata. Discovery is public, which costs nothing: no tool can be invoked without a token.
  - HTTPS enforcement could not be verified: the plaintext port redirected somewhere other than https, so enforcement is unproven.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
  - The authorisation server offers only Dynamic Client Registration (RFC 7591), which MCP 2026-07-28 deprecated in favour of Client ID Metadata Documents.
- **Transport & Reachability**: 0/100
  - Transport check failed: declared streamable-http, but the endpoint redirected instead of responding directly.
- **Schema Quality & AI Usability**: 79/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 2684 tokens (~178/item across 15 items; 15 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 17/100
  - Stability observed for 5 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 15 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 16 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the Billy MCP by usefulapi server?

Billy MCP by usefulapi is a hosted endpoint at https://billy.usefulapi.io/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http io-usefulapi-billy 'https://billy.usefulapi.io/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "io-usefulapi-billy": {
      "url": "https://billy.usefulapi.io/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "io-usefulapi-billy": {
      "type": "http",
      "url": "https://billy.usefulapi.io/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.io-usefulapi-billy]
url = "https://billy.usefulapi.io/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "io-usefulapi-billy": {
      "type": "remote",
      "url": "https://billy.usefulapi.io/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add io-usefulapi-billy --url 'https://billy.usefulapi.io/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  io-usefulapi-billy:
    url: "https://billy.usefulapi.io/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "io-usefulapi-billy": {
      "Transport": "http",
      "Url": "https://billy.usefulapi.io/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add io-usefulapi-billy -t streamable-http -u 'https://billy.usefulapi.io/mcp'
```

### Other

```json
{
  "mcpServers": {
    "io-usefulapi-billy": {
      "type": "http",
      "url": "https://billy.usefulapi.io/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-16 (score 64, +1)

No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-14 (score 63, +3)

- [security] The server rewrote its instructions, which are the text every model session reads
- [functional] The server now declares the “prompts” capability
- [functional] First check of Schema quality: 100
- [functional] New prompt “getting_started”
- [functional] Server version: 1.0.0 → 1.1.0

### 2026-10-13 (score 60, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-12 (score 60)

First indexed and scored.

## MCP tools (15)

### `billy_get_organization` (~60 tokens)

Get the company

The Billy company the access token belongs to: id, name, address, registration (CVR) number, base currency, VAT settings, fiscal year, default payment terms, invoice numbering, default accounts. Good first call. GET /organization.

### `billy_list_contacts` (~156 tokens)

List contacts

List customers and suppliers: name, type, address, CVR/registration number, EAN, payment terms, customer/supplier flags. The API has no documented search filter, so `search` is applied to the returned page only (case-insensitive on name, contact number and registration number); page on with next_page to look further. Paged. GET /contacts.

Input parameters:

- `page` (integer): Page number, 1-based (default 1). Use next_page from the previous reply.
- `page_size` (integer): Records per page, 1-200 (default 50).
- `search` (string): Keep only contacts on the returned page whose name, contactNo or registrationNo contains this text.

### `billy_get_contact` (~48 tokens)

Get a contact

One contact by id, with its contact persons (names and e-mail addresses). GET /contacts/{id}.

Input parameters:

- `id` (string, required): The contact id (from billy_list_contacts).

### `billy_list_invoices` (~365 tokens)

List invoices

List sales invoices and credit notes (newest first by default): number, date, due date, state (draft/approved/voided), amount, tax, balance, isPaid, contactId, currency. Filter by state, customer, number, date, period, paid status or free text. Paged. GET /invoices.

Input parameters:

- `contact_id` (string): Only invoices of this contact (from billy_list_contacts).
- `entry_date_period` (string): Date period: all, year:2026, month:2026-03, quarter:2026-2, dates:2026-01-01...2026-01-31 ...
- `invoice_no` (string): Exact invoice number.
- `is_paid` (boolean): true = only paid invoices, false = only unpaid.
- `max_due_date` (string): Due date on or before (yyyy-mm-dd); with is_paid=false this finds overdue invoices.
- `max_entry_date` (string): Invoice date on or before (yyyy-mm-dd).
- `min_due_date` (string): Due date on or after (yyyy-mm-dd).
- `min_entry_date` (string): Invoice date on or after (yyyy-mm-dd).
- `page` (integer): Page number, 1-based (default 1). Use next_page from the previous reply.
- `page_size` (integer): Records per page, 1-200 (default 50).
- `q` (string): Free-text search over invoice number, order number, contact name, line description, amount.
- `sort_direction` (string): Sort direction (default ASC).
- `sort_property` (string): Sort by (default entryDate).
- `state` (string): Only invoices in this state.

### `billy_get_invoice` (~60 tokens)

Get an invoice

One invoice by id with its lines (product, description, quantity, unit price, amount, tax) and its payment associations. GET /invoices/{id}.

Input parameters:

- `id` (string, required): The invoice id (from billy_list_invoices).

### `billy_list_bills` (~287 tokens)

List bills (supplier invoices)

List bills (purchase invoices from suppliers): supplier, dates, state (draft/approved/voided), amount, balance, isPaid, supplier invoice number. Filter by state, supplier, dates or paid status. Paged. GET /bills.

Input parameters:

- `contact_id` (string): Only bills of this supplier contact.
- `is_paid` (boolean): true = only paid bills, false = only unpaid.
- `max_due_date` (string): Due date on or before (yyyy-mm-dd).
- `max_entry_date` (string): Bill date on or before (yyyy-mm-dd).
- `min_due_date` (string): Due date on or after (yyyy-mm-dd).
- `min_entry_date` (string): Bill date on or after (yyyy-mm-dd).
- `page` (integer): Page number, 1-based (default 1). Use next_page from the previous reply.
- `page_size` (integer): Records per page, 1-200 (default 50).
- `q` (string): Free-text search over supplier name, description, voucher number, amount, supplier invoice number.
- `sort_direction` (string): Sort direction (default ASC).
- `sort_property` (string): Sort by (default entryDate).
- `state` (string): Only bills in this state.
- `suppliers_invoice_no` (string): Exact supplier invoice number.

### `billy_get_bill` (~43 tokens)

Get a bill

One supplier bill by id with its lines. GET /bills/{id}.

Input parameters:

- `id` (string, required): The bill id (from billy_list_bills).

### `billy_list_products` (~131 tokens)

List products

List products and services usable as invoice lines: name, product number, description, sales account, archived flag. The API has no documented search filter, so `search` is applied to the returned page only (name, productNo). Paged. GET /products.

Input parameters:

- `page` (integer): Page number, 1-based (default 1). Use next_page from the previous reply.
- `page_size` (integer): Records per page, 1-200 (default 50).
- `search` (string): Keep only products on the returned page whose name or productNo contains this text.

### `billy_get_product` (~43 tokens)

Get a product

One product by id with its unit prices per currency. GET /products/{id}.

Input parameters:

- `id` (string, required): The product id (from billy_list_products).

### `billy_list_accounts` (~129 tokens)

List accounts (chart of accounts)

The chart of accounts: account number, name, group, nature, VAT rate, bank-account flag and bank details (IBAN, bank name) of bank accounts. With is_bank_account=true this lists the bank accounts whose ids billy_list_bank_lines needs. Paged. GET /accounts.

Input parameters:

- `is_bank_account` (boolean): true = only bank accounts.
- `page` (integer): Page number, 1-based (default 1). Use next_page from the previous reply.
- `page_size` (integer): Records per page, 1-200 (default 50).

### `billy_list_tax_rates` (~97 tokens)

List tax (VAT) rates

The company's VAT rates: name, rate (as a fraction, 0.25 = 25 percent), whether it applies to sales or purchases, active flag. Paged. GET /taxRates.

Input parameters:

- `page` (integer): Page number, 1-based (default 1). Use next_page from the previous reply.
- `page_size` (integer): Records per page, 1-200 (default 50).

### `billy_list_bank_lines` (~355 tokens)

List bank lines

List the bank-statement lines of ONE bank account (read only; nothing is matched or reconciled): date, description, amount, side (debit/credit), reconciled flag, receipt state. Get the account id from billy_list_accounts with is_bank_account=true. Paged. GET /bankLines.

Input parameters:

- `account_id` (string, required): The bank account id (required).
- `entry_date_period` (string): Date period: all, year:2026, month:2026-03, quarter:2026-2, dates:2026-01-01...2026-01-31 ...
- `is_reconciled` (boolean): true = only reconciled lines, false = only unreconciled.
- `max_amount` (number): Amount at most.
- `max_entry_date` (string): Entry date on or before (yyyy-mm-dd).
- `min_amount` (number): Amount at least.
- `min_entry_date` (string): Entry date on or after (yyyy-mm-dd).
- `page` (integer): Page number, 1-based (default 1). Use next_page from the previous reply.
- `page_size` (integer): Records per page, 1-200 (default 50).
- `q` (string): Free-text search over description or amount.
- `receipt_state` (string): Only lines with a missing or uploaded receipt.
- `side` (string): Only debit (money in) or credit (money out) lines.
- `sort_direction` (string): Sort direction (default ASC).
- `sort_property` (string): Sort by (default entryDate).
- `status` (string): Line status (the API defaults to booked).

### `billy_list_postings` (~247 tokens)

List ledger postings

List ledger postings (the bookkeeping entries): date, text, account, amount, side (debit/credit), currency, voided flag. Filter by account, date or period. Read only. Paged. GET /postings.

Input parameters:

- `account_id` (string): Only postings on this account (from billy_list_accounts).
- `entry_date_period` (string): Date period: all, year:2026, month:2026-03, quarter:2026-2, dates:2026-01-01...2026-01-31 ...
- `is_voided` (boolean): true = only voided postings, false = only live ones.
- `max_entry_date` (string): Entry date on or before (yyyy-mm-dd).
- `min_entry_date` (string): Entry date on or after (yyyy-mm-dd).
- `page` (integer): Page number, 1-based (default 1). Use next_page from the previous reply.
- `page_size` (integer): Records per page, 1-200 (default 50).
- `q` (string): Free-text search over the posting text and the originator name.

### `billy_create_contact` (~242 tokens)

Create a contact

WRITE: create ONE new contact (customer and/or supplier) in the company's Billy account. It does not check for duplicates (call billy_list_contacts first) and nothing is sent to the contact. Not idempotent: a repeat call creates a second contact. POST /contacts.

Input parameters:

- `city` (string): City.
- `contact_no` (string): Your own customer or supplier number.
- `country_id` (string): ISO country code (default DK).
- `ean` (string): EAN location number for e-invoicing (Denmark).
- `email` (string): Primary contact e-mail (stored as the primary contact person; nothing is sent).
- `is_customer` (boolean): Customer flag (default true).
- `is_supplier` (boolean): Supplier flag (default false).
- `name` (string, required): Company or person name.
- `phone` (string): Phone number.
- `registration_no` (string): CVR number (Denmark) or EU VAT number.
- `street` (string): Street and number.
- `type` (string): company (default) or person.
- `zipcode` (string): Postal code.

### `billy_create_draft_invoice` (~215 tokens)

Create a draft invoice

WRITE: create ONE invoice in the DRAFT state for an existing contact. The invoice is NOT approved, booked, numbered into the ledger or sent: the user reviews it in Billy and approves and sends it there. The invoice number is assigned by Billy. No payment is created. Not idempotent: a repeat call creates a second draft. POST /invoices with state=draft.

Input parameters:

- `contact_id` (string, required): The customer's contact id (from billy_list_contacts or billy_create_contact).
- `contact_message` (string): Message to the customer shown at the top of the invoice PDF.
- `currency_id` (string): Invoice currency, e.g. DKK (default: the company's base currency).
- `entry_date` (string): Invoice date yyyy-mm-dd (default today, UTC).
- `lines` (array, required): 1-100 invoice lines.
- `tax_mode` (string): Whether unit prices include (incl) or exclude (excl) VAT (default: the company's setting).

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/io-usefulapi-billy/billy#diagnostics

## Score history

- 2026-10-17: 64
- 2026-10-16: 64
- 2026-10-15: 63
- 2026-10-14: 63
- 2026-10-13: 60
- 2026-10-12: 60

## Common questions

### What is the Billy MCP by usefulapi server?

Billy MCP by usefulapi is listed in the public MCP registry as io.usefulapi/billy. Read Billy invoices, bills, contacts, products and postings; create contacts and draft invoices. This page covers its hosted endpoint (https://billy.usefulapi.io/mcp).

### Is the Billy MCP by usefulapi server safe to use?

Billy MCP by usefulapi scores 64 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Billy MCP by usefulapi server expose?

Billy MCP by usefulapi exposes 15 tools: billy_get_organization, billy_list_contacts, billy_get_contact, billy_list_invoices, billy_get_invoice, and 10 more. Their descriptions and schemas cost roughly 2,478 tokens of context every time the server is loaded.

### Does the Billy MCP by usefulapi server require authentication?

Yes. Billy MCP by usefulapi asked us for credentials when we connected, so you will need to authorise it in your MCP client before it can do anything.

### Is the Billy MCP by usefulapi server still maintained?

Billy MCP by usefulapi is still listed as active in the MCP registry. We last reached this channel on 17 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://billy.usefulapi.io/mcp
- Repository: https://github.com/m190/usefulapi-mcp
- Website: https://usefulapi.io/billy/
- Changelog RSS feed: https://verifymcp.io/servers/io-usefulapi-billy/billy.xml
- Changelog JSON feed: https://verifymcp.io/servers/io-usefulapi-billy/billy.json
- HTML version of this page: https://verifymcp.io/servers/io-usefulapi-billy/billy